U.S. patent application number 11/445063 was filed with the patent office on 2006-12-07 for manually operable dosing device for a medium.
Invention is credited to Karl-Heinz Fuchs.
Application Number | 20060273112 11/445063 |
Document ID | / |
Family ID | 36648706 |
Filed Date | 2006-12-07 |
United States Patent
Application |
20060273112 |
Kind Code |
A1 |
Fuchs; Karl-Heinz |
December 7, 2006 |
Manually operable dosing device for a medium
Abstract
1. Dosing device for a medium. 2.1. A dosing device for a medium
with an applicator housing, which has at least one discharge
opening for dispensing the medium, with a pumping means, which has
a pumping chamber arranged in the applicator housing, and with an
elastically flexible membrane, which forms a wall portion of the
pumping chamber and is arranged in an elastically movable manner in
the applicator housing for changing a chamber volume of the pumping
chamber and which is assigned on an outer side facing away from the
pumping chamber an actuating surface for a manual pumping movement,
is known. 2.2. According to the invention, the applicator housing
has a flow path from the pumping chamber to the discharge opening,
and the membrane forms an outlet valve of the pumping chamber. 2.3.
Use for dosing media for cosmetic purposes.
Inventors: |
Fuchs; Karl-Heinz;
(Radolfzell, DE) |
Correspondence
Address: |
FLYNN THIEL BOUTELL & TANIS, P.C.
2026 RAMBLING ROAD
KALAMAZOO
MI
49008-1631
US
|
Family ID: |
36648706 |
Appl. No.: |
11/445063 |
Filed: |
June 1, 2006 |
Current U.S.
Class: |
222/207 |
Current CPC
Class: |
B05B 11/3032
20130101 |
Class at
Publication: |
222/207 |
International
Class: |
B65D 37/00 20060101
B65D037/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 2, 2005 |
DE |
102005026678.9 |
Claims
1. A manually operable dosing device for a medium with an
applicator housing, which has at least one discharge opening for
dispensing the medium, with a pumping means, which has a pumping
chamber arranged in the applicator housing, and with an elastically
flexible membrane, which forms a wall portion of the pumping
chamber and is arranged in an elastically movable manner in the
applicator housing for changing a chamber volume of the pumping
chamber and which is assigned on an outer side facing away from the
pumping chamber an actuating surface for a manual pumping movement,
wherein the applicator housing (3, 3c, 3d, 4, 4a, 4b, 4c, 4d, 5,
5c, 5d) has a flow path (17, 17a, 17b, 17c, 17d) from the pumping
chamber (7, 7c, 7d) to the discharge opening (18, 18a, 18b, 18c,
18d), and wherein the membrane (6, 6c, 6d) forms an outlet valve of
the pumping chamber.
2. The dosing device as claimed in claim 1, wherein the applicator
housing has a ventilating channel (16, 16c, 19), leading to a
medium reservoir (2), and wherein the membrane forms a ventilating
valve (14, 14c, 14d, 15, 15c, 15d) for the ventilating channel.
3. The dosing device as claimed in claim 1, wherein the applicator
housing is provided with a spray nozzle (18, 18b, 18d) as the
discharge opening.
4. The dosing device as claimed in claim 1, wherein the applicator
housing is provided with a discharge opening (18a, 18c) designed
for medium of high viscosity.
5. The dosing device as claimed in claim 1, wherein the actuating
surface (12, 12c, 12d) of the membrane is arranged in a clearance
of the applicator housing and, in the state of rest in which no
pressure is exerted, is aligned in particular such that it is flush
with an outer contour of the applicator housing.
6. The dosing device as claimed in claim 1, wherein the membrane is
produced from an elastomer material as a one-piece, bell- or
dome-shaped component.
7. The dosing device as claimed in claim 1, wherein the applicator
housing is of a multi-part design, and wherein the membrane is
restrained coaxially between an inner part (5, 5c, 5d) and an outer
part (4, 4a, 4c, 4d) of the applicator housing.
8. The dosing device as claimed in claim 5, wherein the actuating
surface of the membrane is provided on the outside of a restraining
region of the membrane in the applicator housing and a lip portion
(13) forming the outlet valve is provided within the restraining
region, and wherein the restraining region of the membrane is
designed in particular as a solid joint.
9. The dosing device as claimed in claim 5, wherein a sealing
portion (14, 14c, 14d) of the membrane that is provided in the
region of the clearance of the applicator housing is provided as a
ventilating valve for the ventilating path, which closes the latter
when no pressure is exerted on the membrane and opens it when the
membrane is manually deformed.
10. The dosing device as claimed in claim 1, wherein the membrane
(6c, 6d) is produced in one piece from an elastomer material and
has a bellows region (23c, 23d), on which at least one peripheral
or helical groove is formed.
11. The dosing device as claimed in claim 10, wherein the membrane
has, in a preferably annular transitional region (26c, 26d) between
the bellows region and a lip portion (13c), at least one groove,
running at least partly around the periphery, to isolate the
movement between the bellows region and the lip portion.
12. The dosing device as claimed in claim 1, wherein at least two
lip portions (13.1, 13.2), which have different geometries, are
provided on the membrane (6, 6a, 6b, 6c, 6d).
13. The dosing device as claimed in claim 1, wherein at least one
sealing element (27c) is provided on the applicator housing (5, 5a,
5b, 5c, 5d) to separate an annular gap portion, provided for
guiding the medium, from an annular gap portion that is free of the
medium.
Description
[0001] The invention relates to a manually operable dosing device
for a medium with an applicator housing, which has at least one
discharge opening for dispensing the medium, with a pumping means,
which has a pumping chamber arranged in the applicator housing, and
with an elastically flexible membrane, which forms a wall portion
of the pumping chamber and is arranged in an elastically movable
manner in the applicator housing for changing a chamber volume of
the pumping chamber and which is assigned on an outer side facing
away from the pumping chamber an actuating surface for a manual
pumping movement.
[0002] Many different designs of dosing devices for a medium are
known. Such dosing devices have manually operable pumping means.
Each pumping means is in connection with a medium reservoir. The
flow path between the medium reservoir and the pumping chamber can
be closed by an inlet valve. To make it possible for the pumping
means to perform a discharging operation, the pumping chamber is in
operative connection with the discharge opening of the dosing
device via an outlet valve. The discharge opening is provided in an
applicator housing of the dosing device, the discharge opening
serving for the dosing or dispensing of the medium to the
surroundings. For actuating the pumping means, a manually operable
actuating element is provided. The pumping means may be designed as
a thrust piston pump or in some other way.
[0003] It is also known to provide bellows pumps, in which the
pumping chamber is at least partially formed by an elastic flexible
membrane. The compression of the pumping chamber, and accordingly
the discharge operation, takes place in a simple way by manually
exerting pressure on the flexible membrane, whereby the latter is
deformed and inevitably reduces the size of a volume of the pumping
chamber. The elastic flexibility of the pumping chamber is designed
in such a way that, once the exerted pressure is removed, the
membrane automatically reverts to the starting position in which no
pressure is exerted, in order to suck the medium that is to be
delivered into the dosing chamber.
[0004] The object of the invention is to provide a dosing device of
the type mentioned at the beginning which makes it possible by
simple means for medium to be discharged by manual operation.
[0005] This object is achieved by the applicator housing having a
flow path from the pumping chamber to the discharge opening, and by
the membrane forming an outlet valve of the pumping chamber. By the
solution according to the invention, the membrane assumes a
multiple function. On the one hand, it forms a wall portion of the
pumping chamber. On the other hand, it serves as an application
surface for manual operation of the pumping means, and finally it
is designed in such a way that it protrudes into the flow path
between the pumping chamber and the discharge opening in such a way
that it forms the outlet valve of the pumping chamber.
Consequently, a number of functional segments of the dosing device
are achieved by means of a single component, namely the elastically
flexible membrane. The solution according to the invention is
suitable for dispensing flowable media or liquids of high or low
viscosity, in particular for cosmetic or pharmaceutical
purposes.
[0006] In an embodiment of the invention, the applicator housing
has a ventilating channel, leading to a medium reservoir, and the
membrane forms a ventilating valve for the ventilating channel. The
ventilating channel makes the dosing device suitable for multiple
dosing, since after each dispensing operation the volume of liquid
dispensed can be made up by air from the surroundings. The fact
that the membrane also forms the ventilating valve for the
ventilating channel provides a further function which is integrated
in the membrane.
[0007] In a further embodiment, the applicator housing is provided
with a spray nozzle as the discharge opening. This embodiment is
particularly advantageous for dispensing liquids as a spray mist
and is suitable in particular for liquids for cosmetic
purposes.
[0008] In a further embodiment of the invention, the applicator
housing is provided with a discharge opening designed for a medium
of high viscosity. This allows gels, ointments, creams and the like
to be dispensed in particular.
[0009] In a further embodiment of the invention, the actuating
surface of the membrane is arranged in a clearance of the
applicator housing and, in the state of rest in which no pressure
is exerted, is aligned in particular such that it is flush with an
outer contour of the applicator housing. As a result, the actuating
surface can be integrated into the outer contour of the dosing
device, and in particular of the applicator housing, in a visually
attractive way.
[0010] The actuating surface, which is part of the membrane, may
either be formed directly as a finger rest, or serves as an
application surface for an actuating element which establishes the
operative connection between the manual exertion of pressure by an
operator and the membrane.
[0011] In a further embodiment of the invention, the membrane is
produced from an elastomer material as a one-piece, bell-shaped
component. The membrane is preferably integrated in an end region
of the applicator housing and is aligned at least largely such that
it is coaxial with a central longitudinal axis of the applicator
housing in the applicator housing.
[0012] In a further embodiment of the invention, the applicator
housing is of a two-part design, and the membrane is restrained
coaxially between an inner part and an outer part of the applicator
housing. The membrane is preferably radially prestressed in the
mounted position. The clearance is preferably provided on an end
region of the outer part of the applicator housing, so that the
actuating surface of the membrane can be operated from an end face
of the outer part. The outer part and the inner part of the
applicator housing are preferably connected to each other
positively or non-positively in the axial direction--with respect
to the central longitudinal axis of the applicator housing. In the
mounted end position of the outer part and the inner part with each
other, the membrane is inevitably also fixed along with them in its
installation position and is preferably radially prestressed. As a
result, a particularly quickly acting valve function is
achieved.
[0013] In a further embodiment of the invention, the actuating
surface of the membrane is provided on the outside of a restraining
region of the membrane in the applicator housing and a lip portion
forming the outlet valve is provided within the restraining region,
and the restraining region of the membrane is designed in
particular as a solid joint. When pressure is manually exerted on
the membrane, preferably quick opening of the lip portion is
brought about, by the chamber that is filled with medium being put
under pressure. The increase in pressure leads to opening of the
outlet valve. This is a particularly preferred embodiment, since it
is ensured that deformation of the membrane inevitably also causes
opening of the outlet valve.
[0014] In a further embodiment of the invention, a sealing portion
of the membrane that is provided in the region of the clearance of
the applicator housing is provided as a ventilating valve for the
ventilating path, which closes the latter when no pressure is
exerted on the membrane and opens it when the membrane is manually
compressed. In an analogous way, deformation of the membrane
inevitably causes the ventilating path to be opened. The membrane
is preferably designed in such a way that, when there is
appropriate deformation of the membrane, at the same time both the
outlet valve for the pumping chamber and the ventilating valve for
ventilating the medium reservoir are opened.
[0015] In a further embodiment of the invention, the membrane is
produced in one piece from an elastomer material and has a bellows
region, on which at least one peripheral or helical groove is
formed. The design of the membrane in the form of bellows allows a
particularly favorable ratio between a volume that is enclosed in
the state of rest of the membrane and a volume that is still
enclosed by the membrane at the end of the discharge operation.
That is to say that, with the membrane designed in such a way, a
greater volume of medium can be delivered, so that the discharge
device equipped in this way can be used for a wider range of
applications. Moreover, a particularly advantageous deformation
behavior of the membrane is achieved by the at least one peripheral
or helical groove, since the membrane is deformed at least
substantially only in the region that is in the form of bellows. By
contrast, an outwardly facing cover plate of the membrane, provided
for example as a finger resting surface, is virtually undeformed
and consequently makes a favorable force transmission and an
advantageous pressure buildup posssible for the dosing means. The
bellows region may be formed in particular by an axial arrangement
of at least two rings in the form of portions of a cone,
respectively oriented conversely and connected to each other in one
piece. As a result, at least one peripheral groove is formed and
the bellows has a substantially V-shaped or U-shaped cross section,
preferably of constant thickness, or a multiple recurrence of such
a cross section. The bellows region may also have a geometry that
is helical, i.e. similar to a screw thread, it being possible in
particular for multi-start constructions, as are known from the
area of multi-start screw threads, to be used for the bellows
region. As a result, particularly favorable flexibility of the
membrane is ensured and flexible materials with different
characteristics can be used.
[0016] In a further embodiment of the invention, the membrane has,
in a preferably annular transitional region between the bellows
region and a lip portion forming the outlet valve, at least one
groove, running at least partly around the periphery, to isolate
the movement between the bellows region and the outlet valve. The
groove which runs at least partly around the periphery, which may
in particular be provided in those sectors of the transitional
region that are coupled with the lip portions acting as outlet
valves, achieves the effect that, when the membrane is actuated and
deformation of the bellows region occurs as a result, there is no
influence on the lip portion, or only little influence. This allows
the lip portion to perform its function as an outlet valve without
being influenced by the deformation of the bellows region.
[0017] In a further embodiment of the invention, at least two lip
portions, which have different geometries, are provided on the
membrane. The geometries of the lip portions may differ in
particular with regard to the wall thickness of the lip portions
and/or the length of the lip portions. This offers the possibility
of realizing at least two different valve characteristics for the
dosing means in a single membrane. Depending on the application,
one of the at least two lip portions can be inserted into the
dosing device in such a way that the outlet valve is formed by this
lip portion. When a somewhat longer lip portion is used, for
example, this outlet valve is suitable for dosing media of high
viscosity, such as gel for example, and has a soft valve opening
characteristic. By contrast, a shorter valve lip has a harder valve
characteristic, as is preferably used for dosing media of low
viscosity, for example aqueous media.
[0018] In a further embodiment of the invention, at least one
sealing element is provided on the applicator housing to separate
an annular gap portion, provided for guiding the medium, from an
annular gap portion that is free of the medium. This ensures
reliable separation of the medium from the surroundings, in
particular makes it possible to ensure that the medium does not get
into the ventilating channel.
[0019] Further advantages and features of the invention will become
evident from the claims and from the following description of
preferred exemplary embodiments of the invention in which reference
is made to the drawings.
[0020] FIG. 1 shows an embodiment of a dosing device according to
the invention for a liquid,
[0021] FIG. 2 shows a further embodiment of a dosing device
according to the invention, which is designed with a discharge
opening for gels, ointments or creams,
[0022] FIG. 3 shows a further embodiment of a dosing device
according to the invention that is similar to FIG. 1,
[0023] FIG. 4 shows the dosing device as shown in FIG. 3 in a
perspective and sectional exploded representation,
[0024] FIG. 5 shows the dosing device as shown in FIGS. 3 and 4 in
a sectional exploded representation,
[0025] FIG. 6 shows a detail of the dosing device as shown in FIG.
5 in the region of a spray nozzle in an enlarged
representation,
[0026] FIG. 7 shows a detail of the dosing device as shown in FIG.
3 in the region of the outlet valve in an enlarged sectional
representation,
[0027] FIG. 8 shows the sectional representation according to FIG.
7, but with the outlet valve opened,
[0028] FIG. 9 shows a further embodiment of a dosing device
according to the invention with a membrane in the form of bellows,
in a sectional representation,
[0029] FIG. 10 shows a further embodiment of a dosing device
according to the invention with a membrane in the form of bellows,
in a sectional exploded representation,
[0030] FIG. 11 shows the inner housing part with sealing ribs in a
plan view.
[0031] A dosing device 1 as shown in FIG. 1 has a medium reservoir
2, of which only a neck region is represented for reasons of
overall clarity. Fitted onto the neck region of the medium
reservoir 2 is an applicator housing 3 to 5. In the applicator
housing 3 to 5, an elastically flexible membrane 6 is integrated in
the way described in more detail below. The membrane 6 is designed
like a dome or bell and forms a one-part component of an elastomer
material, in particular of silicone, of rubber or of similar
material. It is also possible to produce the membrane 6 from a
thermoplastic elastomer.
[0032] The membrane 6 is restrained between two housing parts of
the applicator housing 3 to 5. The membrane 6 is arranged on the
end of the applicator housing and is designed at least largely such
that it is coaxial with a central longitudinal axis M of the
applicator housing 3 to 5. Together with an inner part 5, the
membrane 6 forms a pumping chamber 7 of a pumping means of the
dosing device 1. The inner housing part 5 of the applicator housing
3 to 5 is supported axially downward on a closure part 3 of the
applicator housing 3 to 5. The closure part 3 is screwed by means
of a corresponding internal thread onto an external thread of the
neck region of the medium reservoir 2. In order to prevent sealing
of the neck region 2 and securement against unintentional
detachment of the closure part 3 from the neck region, a sealing
ring 11, which in particular is elastically compressible, is
inserted axially between an end edge of the neck region 2 and an
annular shoulder of the closure part 3.
[0033] The inner housing part 5 has a connection piece, which
protrudes through the sealing ring coaxially with the central
longitudinal axis M, protrudes into the neck region of the medium
reservoir 2 and is provided with a suction tube not designated any
more specifically. To make it possible for the medium reservoir to
be ventilated, there is an annular space between the outer casing
of the inlet connector of the inner housing part 5 and an inner
circumference of the sealing ring 11, even in the pressed state of
the sealing ring 11.
[0034] The membrane 6 and the inner housing part 5 are fixed in
their installation position by the outer housing part 4. The
cup-like, outer housing part 4 is pressed axially from above onto
the closure part 3, the outer housing part 4 engaging over the
sleeve-like closure part 3 over its entire height. The press fit of
the outer housing part 4 on the closure part 3 can be seen well
from the sectional representation of FIG. 1.
[0035] With its dome-like inner contour, the membrane 6 forms the
pumping chamber 7 together with the inner housing part 5. The inlet
connector of the inner housing part 5 opens out into the pumping
chamber 7. The inlet region of the inlet connector can be closed by
an inlet valve 8, which is designed as a plunger-type piston valve.
A valve stem 10 of the inlet valve 8 is guided axially movably
within the inlet region of the inlet connector. Guiding webs 9
serve at the same time as axial securement for a clapper-like end
region 10 of the inlet valve 8 facing the medium reservoir. An
axial movement in the direction of the pumping chamber 7
consequently allows the inlet valve 8 to be transferred from the
closed position, represented in FIG. 1, into its open position.
[0036] The outer housing part 4 has in its upper end region a
circular clearance, into which the membrane 6 protrudes in such a
way that an outer actuating surface 12 of the membrane 6 terminates
at least largely flush with the end outer contour of the outer
housing part 4. The clearance in the outer housing part 4 is
slightly larger than the circular disk-shaped actuating surface 12
of the membrane 6. Following the actuating surface 12, the membrane
6 goes over in the axial direction into an edge region, which
widens conically downward with a peripheral sealing portion 14. In
the state of rest of the membrane 6 in which no pressure is
exerted, this sealing portion 14 terminates in a sealed manner with
a peripheral sealing edge 15 at an axially lower end of the
clearance of the outer housing part 4. As soon as the membrane 6 is
compressed from above by manual pressure of an operator's finger,
the sealing portion 14 and the sealing edge 15 come at least partly
away from their position of contact and open a ventilating path
into the interior of the medium reservoir as long as the membrane 6
is deformed. To make a ventilating path possible from the
surroundings into the interior of the medium reservoir, the
membrane 6 is provided with at least one passage 16. On the inside
of the membrane 6, the inner housing part 5 is also provided with
at least one passage 19, so that the ambient air coming from
outside when there is deformation of the membrane 7 can pass via
the passage 16, the passage 19 and the annular space between the
inlet connector and the sealing ring 11 into the medium
reservoir.
[0037] The outer housing part 4 is provided in the region of a
discharge opening with a spray nozzle 18, which is integrated in
one piece in the outer housing part 4. In the inner housing part 5
on the one hand and the outer housing part 4 on the other hand, a
flow path 17 to the spray nozzle 18 is also formed and is closed by
a lip portion 13 of the membrane 6 when no pressure is exerted on
the membrane 6. The restraint of the membrane 6 is chosen such
that, in the mounted state, the lip portion 13 lies against the
inner housing part 5 in a radially prestressed manner. The lip
portion 13 of the membrane 6 serves as an outlet valve for the
pumping chamber 7. The flow path 17 is formed by corresponding
profilings in the inner housing part 5 and in the outer housing
part 4, the profilings in each case being integrated in one piece
in the respective housing part 4, 5. The lip portion 13 forms a
downwardly protruding leg portion of the membrane 6 axially under a
restraining region at which the membrane 6 is clamped in a sealed
manner annularly between an annular shoulder of the outer housing
part 4, delimiting the clearance, and a bottom portion of the inner
housing part 5, a remaining bottom surface of the housing part 5
forming the pumping chamber 7 together with the inner contour of
the membrane 6. The restraining region forms a solid joint of the
membrane 6 for the lip portion 13. As soon as the membrane 6 is
subjected to pressure axially from its position of rest,
represented in FIG. 1, it is deformed downward by substantially
axial movement of the actuating surface 12. In the restraining
region, this inevitably brings about a torque, which has the effect
when pressure is exerted of a radially downward movement of the lip
portion 13, which is relatively thin-walled in comparison with the
portion of the membrane 6 surrounding the pumping chamber 7. The
flow pressure of the medium caused by actuation of the membrane
makes the elastically radially prestressed lip portion open in a
way corresponding to its valve function. As a result, together with
the pressure increase within the pumping chamber 7 brought about by
the compression, the flow path 17 for the medium to be dispensed is
opened, whereby the medium, namely the corresponding liquid, can be
dispensed through the spray nozzle 18 into the surroundings. As
long as pressure is exerted axially on the membrane 6, the
ventilating path via the ventilating valve 14, 15 into the medium
reservoir is opened, so that a negative pressure in the medium
reservoir can be equalized. After relieving the membrane 6 of
pressure, it inevitably reverts to the starting position,
represented in FIG. 1, on account of its elasticity. As a result of
the increase in volume of the pumping chamber 7, a negative
pressure is inevitably produced in it, leading to upward opening of
the inlet valve 8 and renewed filling of the pumping chamber 7. A
renewed discharge operation is brought about by exerting pressure
from above on the actuating surface 12 of the membrane 6. The
pumping chamber 7 is compressed axially downward. If the membrane 6
is pressed to the bottom of the pumping chamber 7, the inlet valve
8 is also inevitably pressed back into its closed position by this
manual compressive movement. At the same time, renewed ventilation
of the medium reservoir takes place via the ventilating valve 14,
15, and the medium located in the pumping chamber 7 is once again
discharged via the flow path 17 and the spray nozzle 18. This
pumping operation can be repeated at will, until a suction tube of
the pumping means can no longer suck in any liquid in the medium
reservoir.
[0038] The embodiment represented by the sectional representation
of FIG. 2 corresponds substantially to the embodiment described in
detail above with reference to FIG. 1. The dosing device 1a
represented in FIG. 2 is therefore merely described with respect to
its differences. Components that differ are provided with the same
reference numerals but with the addition of the letter a. All other
components correspond to the dosing device as shown in FIG. 1, so
that either the same reference numerals are used or, to improve
overall clarity, the reference numerals have been omitted. With
respect to use of the reference numerals, reference is made to this
extent to the representation as shown in FIG. 1. The dosing device
1a as shown in FIG. 2 serves preferably for dispensing media of
high viscosity, such as gels, creams or ointments. For this
purpose, the outer housing part 4a is provided with a modified
discharge opening 18a. The flow paths 17a for the medium are also
modified with respect to the embodiment as shown in FIG. 1. More
details can be seen well from the sectional representation as shown
in FIG. 2. The nose-shaped outlet opening 18a is also integrated in
one piece in the outer housing part 4a.
[0039] In the case of both embodiments, both the closure part 3 and
also the inner housing part 5 and the outer housing part 4a are in
each case produced from a thermoplastic material. The inlet valve 8
preferably likewise consists of a thermoplastic material.
[0040] The embodiment as shown in FIGS. 3 to 8 corresponds
substantially to the dosing device 1 as shown in FIG. 1. To avoid
repetition, reference is therefore additionally made to the
disclosure of the dosing device as shown in FIG. 1. Insofar as
details that are also included in the dosing device 1 as shown in
FIG. 1 are described in respect of the embodiment as shown in FIGS.
3 to 8, the following disclosure also applies as a description of
the embodiment as shown in FIG. 1. The embodiment as shown in FIGS.
3 to 8 is identical to the dosing device 1 as shown in FIG. 1 apart
from a minor modification of the nozzle outlet. For the sake of
better overall clarity, the same reference numerals have been used
for the embodiment as shown in FIGS. 3 to 8 as in the embodiment as
shown in FIG. 1. With respect to modified parts, the letter "b" has
been added to the respective reference numeral. With regard to the
disclosure that is essential for the invention, reference is hereby
additionally made expressly to the disclosure content of the
drawings according to FIGS. 3 to 8.
[0041] As can be seen well from FIGS. 5 to 8, the flow paths 17b in
the outer housing part 4b are of a slightly modified design in
comparison with the embodiment as shown in FIG. 1. The detailed
configuration of the flow paths 17b integrally formed in the outer
housing part 4 can be seen well in particular from FIGS. 6 to
8.
[0042] The lip portion 13 of the membrane 6 is fitted onto the
conical region of the inner housing part 5 under elastic radial
prestress and is fixed in this radially prestressed position by the
already described pressing between the outer housing part 4b and
the inner housing part 5 or closure part 3.
[0043] As soon as the pumping chamber 7 is compressed by pressure
being exerted on the membrane 6, on the actuating surface 12, the
increased pressure of the medium inevitably leads to an elastic
opening of the lip portion 13 corresponding to FIG. 8, serving as
an outlet valve. When the exertion of pressure on the membrane 6 is
removed, the pumping chamber 7 increases in size again. The
negative pressure that is produced has the effect of closing the
outlet valve in the form of the lip portion 13 and opening the
inlet valve 8, in order to allow a corresponding replenishing flow
of medium.
[0044] In order to avoid correctly aligned mounting of the inner
housing part 5 in relation to the closure part 3 and in particular
undesired twisting of the inner housing part 5 in relation to the
closure part 3 in the mounted operating state of the dosing device
1b, mutually corresponding insertion profilings 20, 21 are provided
on the inner housing part 5 and on the closure part 3,
respectively, making it possible for the housing part 5 and the
closure part 3 to be inserted axially one into the other and, in
the fitted-together state, subsequently forming a means of
preventing the inner housing part from being twisted in relation to
the closure part 3.
[0045] The embodiments as shown in FIGS. 9 and 10 correspond
substantially to the dosing device 1 as shown in FIG. 1. To avoid
repetition, reference is therefore additionally made to the
disclosure of the dosing device as shown in FIG. 1. The embodiments
as shown in FIGS. 9 and 10 differ from the embodiment according to
FIG. 1 substantially with regard to the membrane. For the sake of
better overall clarity, the same reference numerals have been used
for the embodiments as shown in FIGS. 9 and 10 as in the embodiment
as shown in FIG. 1, respectively supplemented by the letters "c"
and "d".
[0046] Coinciding with the dosing device 1 as it is known from FIG.
1, the dosing device 1c that is represented in FIG. 9 also has an
applicator housing 3c, which can be screwed onto a medium reservoir
(not represented) and onto which a closure part 4c is pressed with
positive engagement. Fitted onto the applicator housing 3c is an
inner housing part 5c, which together with a membrane 6c forms a
pumping chamber 7c. The membrane 6c is in this case substantially
formed by an end plate 22c, which has a thick wall thickness, and a
bellows region 23c, adjoining it in one piece. The bellows region
23c has a thin wall thickness and has a substantially V-shaped
cross section. Adjoining the bellows region 23c is a transitional
region 24c, which is designed substantially as a planar ring and is
formed in one piece with a slightly conically shaped, peripheral
lip portion 13c. The bellows region 23c has two helical grooves,
which are offset by 180.degree., are arranged in the manner of a
two-start screw thread and, as a result, ensure the particularly
advantageous flexibility of the bellows region 23c. The end plate
22c, provided with a greater wall thickness, has a radially outer,
peripheral sealing collar 24c. The sealing collar 24c lies flat
against an inner end face of the closure part 4c and thereby closes
the passage 16c, which is designed substantially identically to the
dosing device 1 according to FIG. 1, as long as the membrane is in
the rest position, as represented in FIG. 9.
[0047] As a departure from the dosing device 1 according to FIG. 1,
in the embodiment according to FIG. 9 an inlet valve 8c, designed
as a ball check valve, is provided, the valve ball, which is not
designated any more specifically, being restricted in an opening
stroke by three holding lugs arranged in a circular manner. In the
rest position represented in FIG. 9, the valve ball rests in a
sealing manner in a substantially conical valve seat. Coinciding
with the dosing device known from FIG. 1, a flow path 17c and a
discharge opening 18c are provided. The discharge opening 18c is
provided for delivery of the medium that is enclosed in the pumping
chamber 7c and can be subjected to pressure when the membrane is
actuated, and is designed as a discharge opening for media of high
viscosity, in particular gel-like media.
[0048] The dosing device id represented in FIG. 10 differs from the
dosing device 1c according to FIG. 9 merely by the membrane 6c
being fitted differently on the inner housing part 5c. Furthermore,
a different closure part 4c is provided, equipped with a spray
nozzle 18c for the discharge of media of low viscosity, in
particular aqueous media. In the representation of FIG. 10 it is
evident that the membrane 6c has two differently shaped lip
portions, of which a first lip portion 13.1 is made shorter than a
second lip portion 13.2. As a result, different valve
characteristics are obtained in conjunction with the inner housing
part 5d. In this case, the shorter lip portion 13.1 is intended for
a higher pressure buildup in the pumping chamber 7c, and is
therefore suitable in particular for aqueous media of low
viscosity, which are to be discharged in a finely atomized form. By
contrast, the longer lip portion 13.2 is designed for the outlet
valve to open already under low pressure, and is therefore suitable
in particular for media of high viscosity, in particular gels.
[0049] In the embodiment represented in FIG. 10, the closure part
4d is equipped with a spray nozzle 18d for media of low viscosity.
Correspondingly, the membrane 6c is mounted on the inner housing
part 5c in such a way that the spray valve is formed by the inner
housing part 5c and the short lip portion 13.1. In an embodiment of
the dosing device which is not represented but is suitable in
particular for media of high viscosity, such as gels, the inner
housing part is in operative connection with the longer lip portion
and forms the spray valve. In the case of the membranes 6c and 6d,
as they are represented in FIGS. 9 and 10, provided on an end face
of the transitional region 26c that is facing the inner housing
part 5c or 5d is a relief groove 25c or 25d, respectively, running
at least partly around the periphery and intended for creating a
mechanical isolation between the bellows region 23c or 23d and the
lip portions 13c or 13.1 and 13.2, respectively.
[0050] To actuate the dosing devices 1c or 1d, only the embodiment
of which according to FIG. 9 is referred to below by way of
example, the user must exert an operating force on the actuating
surface 12c. The actuating force has the effect of putting the
medium that is enclosed in the pumping chamber 7c under pressure.
When an adequate pressure level is reached, the lip portion 13c is
deflected from the rest position, represented in FIG. 9, into an
opening position, so that the medium can flow along the flow path
17c and past the lip portion 13c into the discharge opening 18c and
from there away into the surroundings. The flowing away of the
medium has the effect of reducing the volume that is enclosed in
the pumping chamber 7c and of causing an elastic deformation of the
membrane 6c. With continued application of the actuating force and
the associated discharge of medium, the membrane 6c comes to lie
with the end plate 22c on the inner housing part 5c. In this
situation, the sealing collar 24c has also come away from the inner
end face of the closure part 4c and consequently opens the passage
16c to the medium reservoir (not represented). When the end plate
22c impinges on the inner housing part 5c, the discharge operation
ends and the user reduces the actuating force on the membrane 6c.
This allows a return stroke of the membrane 6c and re-filling of
the pumping chamber 7c with medium from the medium reservoir to
begin.
[0051] Since the membrane 6c is designed in the manner of a
multi-start helical spring, it has the tendency to be deformed back
again into the starting position according to FIG. 9. The recovery
causes a negative pressure to be produced in the pumping chamber
7c. The negative pressure brings about opening of the inlet valve
8c and consequently a replenishing flow of medium from the medium
reservoir (not represented), since the lip portion 13c seals off
the flow path 17c and consequently prevents ambient air from
flowing into the pumping chamber 7c. In the meantime, ambient air
can flow through the opened passage 16c into the medium container
to make up the difference and equalize the pressure there. As soon
as the sealing collar 24c resumes contact with the inner surface of
the closure part 4c, and consequently prevents further movement of
the end plate 21c, the passage 16c is closed and the return stroke
is completed by re-filling of the pumping chamber 7c.
[0052] According to FIG. 11, the applicator housing 5c is provided
with two sealing ribs 27c, which extend in the axial direction on
the conical outer surface of the applicator housing 5c and are made
to continue from there onto the planar, annular region of the
applicator housing 5c. The sealing ribs 27c perform the task of
separating the annular gap that is formed between the applicator
housing 5c and the membrane and can be exposed to medium via the
flow path from an annular gap portion facing away from it. In
addition, the sealing ribs 27c also seal the membrane off at the
end. This prevents medium from penetrating into the annular gap
portion arranged alongside the ventilating channel before, during
and after the discharge operation. The sealing ribs locally widen
the lip portions, formed as a conically peripheral skirt, in such a
way that there is a press fit between the applicator housing 5c and
the membrane, whereby the desired sealing effect is achieved. This
makes it possible to prevent medium from collecting in the
ventilating channel and possibly leading to contamination of the
ambient air flowing into the medium reservoir. Provided on the
applicator housing 5c is a coding surface 28c, which is intended to
enable the applicator housing 5c to be installed in the closure
part 4c in the correct position, so that incorrect mounting is
virtually ruled out. Use of the applicator housing 5c described in
FIG. 11 is not restricted to the embodiment of FIG. 9, but can be
applied to all the dosing devices described above.
* * * * *